Everything You Need to Know about Narcissists, Psychopaths, and Abuse - click on this link: http://www.narcissistic-abuse.com/faq1.html
Somatic narcissists are often portrayed as sex addicts or histrionic. But really they derive their narcissistic supply not so much from the sex act as from the process of securing it: the conspiracies and assignations, the chase and conquest, the subjugation and habituation of their targets, and even from dumping and discarding their prey, once having extracted the attention and admiration they had sought. These extracurricular activities endow them with a sense of omnipotence and all-pervasive control. Their sway over their paramours and would-be lovers proves to them (and to others) their uniqueness, desirability and irresistibility.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 3 DVDs with 16 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)